<template>
    <div class="type-nav">
        <div class="container">
            <div class="nav-left"
                 @mouseleave="moveOut"
                 @mouseenter="isShow = true"
            >
                <h2 class="all">全部商品分类</h2>
                <transition name="sort">
                    <div class="sort" @click="toSearch" v-show="isShow">
                        <div class="all-sort-list2">
                            <div class="item"
                                 v-for="(c1,index) in categoryList"
                                 :class="{item_on:currentIndex === index}"
                                 :key="c1.categoryId"
                                 @mouseenter="moveIn(index)"
                            >
                                <h3>
                                    <a href="javascript:;" :data-category1Id="c1.categoryId" :data-categoryName="c1.categoryName">{{c1.categoryName}}</a>
                                </h3>
                                <div class="item-list clearfix">
                                    <div class="subitem">
                                        <dl class="fore" v-for="c2 in c1.categoryChild" :key="c2.categoryId">
                                            <dt>
                                                <a href="javascript:;" :data-category2Id="c2.categoryId" :data-categoryName="c2.categoryName">{{c2.categoryName}}</a>
                                            </dt>
                                            <dd>
                                                <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                                                    <a href="javascript:;" :data-category3Id="c3.categoryId" :data-categoryName="c3.categoryName">{{c3.categoryName}}</a>
                                                </em>
                                            </dd>
                                        </dl>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </transition>
                
            </div>
            <nav class="nav">
                <a href="javascript:;">服装城</a>
                <a href="javascript:;">美妆馆</a>
                <a href="javascript:;">尚品汇超市</a>
                <a href="javascript:;">全球购</a>
                <a href="javascript:;">闪购</a>
                <a href="javascript:;">团购</a>
                <a href="javascript:;">有趣</a>
                <a href="javascript:;">秒杀</a>
            </nav>
        </div>
    </div>
</template>

<script>
import {mapActions,mapState} from "vuex";
import throttle from 'lodash/throttle';
export default {
    name: "TypeNav",
    data() {
        return {
            currentIndex: -1,
            isShow:true
        }
    },
    created() {
        if (this.$route.path !== '/home'){
            this.isShow = false
        }
    },
    computed:{
      ...mapState({categoryList:(state)=>state.home.categoryList})
    },
    methods:{
        ...mapActions(['getCategoryList']),
        
        //添加节流
        moveIn:throttle(function (index){
            this.currentIndex = index
        },20,{trailing:false}),
        //利用事件委派来实现跳转
        toSearch(e){
            if (e.target.nodeName !==  'A'){
                return;
            }
            console.dir(e.target.dataset)
            const {category1id,category2id,category3id,categoryname} = e.target.dataset;
            let query = {}
            category1id?query.category1Id = category1id : "";
            category2id?query.category2Id = category2id : "";
            category3id?query.category3Id = category3id : "";
            query.categoryName = categoryname;
            console.log(query);
            let location = {
                name:'search',
                    query
            }
            if (this.$route.params){
                location.params = this.$route.params
            }
            if (this.$route.path == '/home'){
            this.$router.push(location)
                }
            this.$router.replace(location)
            
        },
        moveOut(){
            this.currentIndex = -1;
            if (this.$route.path !== '/home'){
                this.isShow = false
            }
        }
    }
}
</script>

<style scoped lang="less">
.type-nav {
    border-bottom: 2px solid #e1251b;
    
    .container {
        width: 1200px;
        margin: 0 auto;
        display: flex;
        position: relative;
        
        .all {
            width: 210px;
            height: 45px;
            background-color: #e1251b;
            line-height: 45px;
            text-align: center;
            color: #fff;
            font-size: 14px;
            font-weight: bold;
        }
        
        .nav {
            a {
                height: 45px;
                margin: 0 22px;
                line-height: 45px;
                font-size: 16px;
                color: #333;
            }
        }
        
        .sort {
            position: absolute;
            left: 0;
            top: 45px;
            width: 210px;
            height: 461px;
            position: absolute;
            background: orange;
            z-index: 999;
            
            .all-sort-list2 {
                .item {
                    h3 {
                        line-height: 30px;
                        font-size: 14px;
                        font-weight: 400;
                        overflow: hidden;
                        padding: 0 20px;
                        margin: 0;
                        
                        a {
                            color: #333;
                        }
                    }
                    
                    .item-list {
                        display: none;
                        position: absolute;
                        width: 734px;
                        min-height: 460px;
                        background: #f7f7f7;
                        left: 210px;
                        border: 1px solid #ddd;
                        top: 0;
                        z-index: 9999 !important;
                        
                        .subitem {
                            float: left;
                            width: 650px;
                            padding: 0 4px 0 8px;
                            
                            dl {
                                border-top: 1px solid #eee;
                                padding: 6px 0;
                                overflow: hidden;
                                zoom: 1;
                                
                                &.fore {
                                    border-top: 0;
                                }
                                
                                dt {
                                    float: left;
                                    width: 54px;
                                    line-height: 22px;
                                    text-align: right;
                                    padding: 3px 6px 0 0;
                                    font-weight: 700;
                                }
                                
                                dd {
                                    float: left;
                                    width: 680px;
                                    padding: 3px 0 0;
                                    overflow: hidden;
                                    
                                    em {
                                        float: left;
                                        height: 14px;
                                        line-height: 14px;
                                        padding: 0 8px;
                                        margin-top: 5px;
                                        border-left: 1px solid #ccc;
                                    }
                                }
                            }
                        }
                    }
    
                    &.item_on {
                        background-color: skyblue;
                        .item-list {
                            display: block;
                        }
                    }
                }
            }
        }
        .sort-enter{
            height: 0;
            opacity: 0;
        }
        .sort-enter-to{
            height: 461px;
            opacity: 1;
        }
        .sort-enter-active{
           transition: all 0.7s;
        }
    }
}

</style>